When the patch SHA 931f7c6 introduced PIE support for BL31,
adding the GOT section when the SEPARATE_CODE_AND_RODATA=0
to the linker script was erroneously omitted. This patch corrects
the same.

Also the patch reduces the alignment requirement for GOT and RELA
sections from 16 bytes to 8. Comments are added explain the
intent for alignment.

Change-Id: I8035cbf75f346f99bd56b13f32e0b3b70dd2fe6c
Signed-off-by: Soby Mathew <soby.mathew@arm.com>